<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in cartInfo" :key="item.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="item.isChecked == 1"
              @change="updateChecked(item, $event)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">
              {{ item.skuName }}
            </div>
          </li>
          <li class="cart-list-con3">
            <span class="price">{{ item.cartPrice }}</span>
          </li>
          <li class="cart-list-con4">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="handler(-1, -1, item)"
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              :value="item.skuNum"
              minnum="1"
              class="itxt"
              @change="handler(0, $event.target.value * 1, item)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="handler(1, 1, item)"
              >+</a
            >
          </li>
          <li class="cart-list-con5">
            <span class="sum">{{ item.skuNum * item.cartPrice }}</span>
          </li>
          <li class="cart-list-con6">
            <a href="#none" class="sindelet" @click="deleteGoods(item.skuId)"
              >删除</a
            >
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="isAllChecked&&cartInfoList.length!=0"
          @change="updateCheckedAll($event)"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择 <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import throttle from 'lodash/throttle' //debounce
import { mapGetters } from 'vuex'
export default {
  name: 'ShopCart',
  mounted() {
    this.getData()
  },
  methods: {
    getData() {
      this.$store.dispatch('getShopCartList')
    },
    //修改购买的商品数量
    /* type触发类型；diffNum新的值和需要传给服务器的差值; item修改的商品 */
    //防抖防止点击过快时出现负数，但还是出现了0，延时太长体验又不好，还是节流好一些
    handler: throttle(async function (type, diffNum, item) {
      console.log(type, diffNum, item)
      switch (type) {
        case -1:
          diffNum = item.skuNum > 1 ? -1 : 0
          break
        case 1:
          diffNum = 1
          break
        case 0:
          if (isNaN(diffNum) || diffNum != parseInt(diffNum) || diffNum < 1) {
            console.log('wenti')
            diffNum = 0
          } else {
            //最终值=输入的值-原有的值
            diffNum = diffNum - item.skuNum
          }
          break
      }
      try {
        await this.$store.dispatch('addOrUpdateCart', {
          skuId: item.skuId,
          skuNum: diffNum
        })
        this.getData()
      } catch (error) {
        console.log(error)
      }
      this.getData()
    }, 600),

    //删除商品数据
    async deleteGoods(skuId) {
      try {
        await this.$store.dispatch('deleteGoodsById', skuId)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //修改选中状态
    async updateChecked(item, event) {
      try {
        let isChecked = event.target.checked ? '1' : '0'
        await this.$store.dispatch('updateCheckedById', {
          skuId: item.skuId,
          isChecked
        })
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //删除所有选中商品
    async deleteAllChecked() {
      try {
        await this.$store.dispatch('deleteAllChecked')
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //全选按钮的响应事件
    async updateCheckedAll(event) {
      try {
        let isChecked = event.target.checked == 1 ? 1 : 0
        await this.$store.dispatch('updateCheckedAll', isChecked)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    }
  },
  computed: {
    ...mapGetters(['cartInfoList']),
    //购物车信息
    cartInfo() {
      return this.cartInfoList.cartInfoList || []
    },
    //总价
    totalPrice() {
      let sum = 0
      this.cartInfo.forEach((element) => {
        sum = sum + element.cartPrice * element.skuNum
      })
      return sum
    },
    //是否全选
    isAllChecked() {
      //一个不成立就返回false
      return this.cartInfo.every((item) => item.isChecked == 1)
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 10%;
        }

        .cart-list-con4 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con5 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con6 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
